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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735150172611a633eade75278b23ecc24fe0e78118c02c1124cf331b559e201e' 
  AND token = 'TtPmh752+e251Yf9Hw1ECmsdZEpxwqeYP/y7muSI08Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}